For Latin Christians/Roman Catholics Holy Thursday night marks the celebration of the Mass of the Lords Supper when we commemorate the institution of the Eucharist, the priesthood and remember the Mandatum - the great commandment
At the Last Supper, Jesus took a basin and a towel, got down on his hands and knees and washed the feet of all of his apostles. After this action, he commanded the apostles, “I have given you a model to follow, so that as I have done for you, you should also do” (John 13:15). This is Jesus’ commandment: Just as Jesus has been a servant to his apostles, so the apostles must go out into the world and be servants to everyone around them.
We are called to do the same in our daily lives. Well, we are not called literally to wash each other’s feet (though sometimes that may be the case). The action of washing one another’s feet reminds us of the call to humble servitude. Foot washing is not a re-enactment or re-creation of a past event, but rather, it is a commemorative action that reminds us that God calls us first and foremost to be servants to others in our daily lives.
At the very first Last Supper, Jesus also instituted the Eucharist for the Church. At this Holy Thursday celebration, we are reminded of who we are in Jesus Christ and that, through the sacrament of the Eucharist, we are and we become even more the Body of Christ together.
At the conclusion of the Holy Thursday celebration, there is no concluding prayer. Once the celebration of the Eucharist is completed, there is a Eucharistic Procession (where the Eucharist that is left from Communion is processed to a Chapel of Reservation). This procession to the Chapel of Reservation reminds us of Jesus’ time in the garden of Gethsemane when he prayed so fervently through the night. The entire community is invited to join in this procession and then join in the silent prayer and adoration until night prayer is prayed and the Eucharist is put in the Tabernacle. The gathered community leaves in silence only to return in prayer the next day for the Good Friday celebration.